Frost dates for Islip Li Macarthur Airport, New York
Half of years have their last spring frost by April 10, but 1 year in 10 still frosts after April 25.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- April 25
- 1 year in 5
- April 20
- 3 years in 10
- April 16
- 2 years in 5
- April 13
- Half of years (the median)
- April 10
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 18
- 1 year in 5
- October 24
- 3 years in 10
- October 28
- 2 years in 5
- October 31
- Half of years (the median)
- November 2
- Growing season
- about 207 days
- Hardiness zones nearby
- 7a, 7b
- Summer days
- a usual high of about 27 °C80 °F
- Lettuce and spinach run to seed
- June to August, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~4 °C39 °F · low ~-4 °C25 °F · rain ~93 mm3.7 in
- February
- high ~5 °C41 °F · low ~-4 °C26 °F · rain ~84 mm3.3 in
- March
- high ~9 °C48 °F · low ~0 °C32 °F · rain ~115 mm4.5 in
- April
- high ~15 °C58 °F · low ~5 °C41 °F · rain ~103 mm4.1 in
- May
- high ~20 °C68 °F · low ~10 °C51 °F · rain ~83 mm3.3 in
- June
- high ~25 °C77 °F · low ~16 °C61 °F · rain ~102 mm4 in
- July
- high ~28 °C83 °F · low ~20 °C67 °F · rain ~83 mm3.3 in
- August
- high ~27 °C81 °F · low ~19 °C66 °F · rain ~108 mm4.2 in
- September
- high ~24 °C75 °F · low ~15 °C59 °F · rain ~91 mm3.6 in
- October
- high ~18 °C64 °F · low ~8 °C47 °F · rain ~101 mm4 in
- November
- high ~12 °C54 °F · low ~3 °C38 °F · rain ~87 mm3.4 in
- December
- high ~7 °C44 °F · low ~-1 °C30 °F · rain ~120 mm4.7 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Islip Li Macarthur Airport station (listed by NOAA as Islip Li Macarthur Ap, USW00004781), at 40.79, -73.10. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
11705, 11715, 11716, 11717, 11720, 11722, 11730, 11738, 11739, 11741, 11742, 11749…
+12 moreShow fewer
11751, 11752, 11755, 11767, 11769, 11770, 11772, 11779, 11782, 11787, 11788, 11796.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Shirley Brookhaven Airport, NY, last frost by April 18
- Bridgeport Sikorsky Mem Airport, CT, last frost by April 5
- Oceanside, NY, last frost by April 7
- New Haven Tweed Airport, CT, last frost by April 17
- Bronx, NY, last frost by April 1
- New York Laguardia Airport, NY, last frost by March 26
Other stations in New York.
- Dobbs Ferry-Ardsley, NY, last frost by April 20
- New York Cntrl Pk Twr, NY, last frost by March 30
- Yorktown Heights 1 W, NY, last frost by April 25
- Millbrook 3 W, NY, last frost by May 4
- Mohonk Lake, NY, last frost by April 21
- Hudson Correctional Facility, NY, last frost by April 25
- Liberty 1 NE, NY, last frost by May 9
- E Jewett, NY, last frost by May 20
When do I plant? · Where the dates come from
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